Asymmetric Copolymerisations

Chiral aluminium complexes are widely used as hard chiral Lewis acids due to their cheapness, easy preparation, and high reactivity. Impressive achievements have been obtained in asymmetric cyanohydrin synthesis, 

in Lewis Acids in Organic Synthesis, ed. H. Yamamoto, Wiley-VCH, Weinheim, 2000, vol. I, pp. 283-354 (b) S. Saito, in Main Group Metals in Organic Synthesis, ed. H. Yamamoto and K. Oshima, Wiley-VCH, Weinheim, 2004, pp. 189-306 (c) Z. Zhang, B. Wan and H. Chen, Prog. Chem., 2003,15, 487-494. 

Bandini, M. Fagioli, P. Melchiorre, A. Melloni and A. Umani-Ronchi, Tetrahedron Lett, 2003, 44, 5843-5846. 

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Iggo and coworkers have studied the asymmetric copolymerisation of styrene with CO catalyzed by Pd-(R,S)-BINAPHOS complexes under both diffusion- and... 

Relevant mechanistic aspects of the asymmetric copolymerisation of propene with CO have been disclosed by an NMR study of subsequent reactions of the complex [Pd(Me)(NCMe)((R,S)-BINAPHOS)]BAr4 with CO and propene (Scheme 7.23) [7a-f],... 

The asymmetric copolymerisation of carbon dioxide and cyclohexene oxide was realised by the Sugimoto group with chiral binuclear aluminium p-ketoiminate 57 as the catalyst (Scheme 19.65). The asymmetric copolymerisations were found to be significantly dependent on the size of epoxide, temperature, and kind/amount of activators. 

OSO4 Copolymerisation of l,4-bis(9-quinyl)-phthalazine with methyl methacrylate. Asymmetric dihydroxylation (cf. Chapter 3.6.1). other polymer-supported catalysts for asymmetric dihydroxylation have been presented in the recent literature.25 - ... 

Non-crosslinked polystyrene with salen ligand Non-crosslinked polystyrene with onium salt residues Non-crosslinked polystyrene copolymerised with a chiral phosphine ligand 14,765 0.5-3.8" 0.7-2.3 CH2Cl2,THF, EtOAc, DMF DMF,DMSO,DMA, toluene, anisole, MeOH,MeCN, diglyme Asymmetric epoxidation Regioselective addition reaction of phenyl glycidyl ether with S-phenyl thioacetate Pt-catalysed asymmetric hydroformylation of olefins Precipitation (methanol) (r) Precipitation (diethyl ether) (r) [68] [142] [143]... 

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